Spring coil



FIG. 1 is a front view of the spring coil, the rear view of which isidentical with the front view;

FIG. 2 is a side view of the spring coil, the opposite side of which isidentical;

FIG. 3 is a top plan view of the spring coil; and

FIG. 4 is a bottom plan view of the spring coil.

The ornamental design for a spring coil, substantially as shown anddescribed.